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With Trump’s success, Koch brothers focus on down-ballot races

After much speculation about the role the Koch brothers will play in this cycle's presidential primary, they are unlikely to get involved at all.

Businessman David Koch arrives at the Metropolitan Museum of Art Costume Institute Gala Benefit celebrating the opening of "Charles James: Beyond Fashion" in Upper Manhattan on May 5, 2014. (Carlo Allegri/Reuters)
Businessman David Koch arrives at the Metropolitan Museum of Art Costume Institute Gala Benefit celebrating the opening of "Charles James: Beyond Fashion" in Upper Manhattan on May 5, 2014.REUTERS

Leigh Ann Caldwell